生成除某些值以外的随机数 [英] Generate random numbers except certain values

问题描述

我想生成随机数，但不希望它们来自 exclude 数组.这是我的代码.

I want to generate random numbers, but don't want them to be from exclude array. Here is my code.

public int generateRandom(int start, int end, ArrayList<Integer> exclude) {
    Random rand = new Random();
    int range = end - start +1 - exclude.size();
    int random = rand.nextInt(range) + 1;

    for(int i = 0; i < exclude.size(); i++) {
        if(exclude.get(i) > random) {
            return random;
        }
      random++;
    }

    return random;
}

我在 while 循环中使用此函数，并在每次迭代期间向 exclude 添加一个新值.有时它返回属于exclude 的数字.有什么问题?

I use this function in a while loop, and during each iteration I add a new value to exclude. Sometimes it returns numbers that belong to exclude. What's the problem?

推荐答案

if(!exclude.contains(random))
    return random;

每次都会返回不在 exclude 中的值时尝试此操作.

Try this every time it will return the value that is not in exclude.

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